CONSOLIDATED CONDENSED BALANCE SHEETS (UNAUDITED) (Parenthetical) (USD $) In Thousands, except Share data	Jun. 30, 2011	Dec. 31, 2010
CONSOLIDATED CONDENSED BALANCE SHEETS (UNAUDITED) (Parenthetical) [Abstract]
Property and Equipment, Accumulated Depreciation	$ 88,237	$ 79,942
Common Stock, par value (in dollars per share)	$ 1	$ 1
Common Stock, shares authorized (in shares)	75,000,000	75,000,000
Common Stock, shares issued (in shares)	47,286,104	47,089,593
Common Stock, shares outstanding (in shares)	47,286,104	47,089,593